Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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The Effect of Age at First Calving and Calving Interval on Productive Life and Lifetime Profit in Korean Holsteins

  • Do, Changhee (Department of Animal Biosystem Science, College of Agriculture and Life Science, Chungnam National University) ;
  • Wasana, Nidarshani (Department of Animal Biosystem Science, College of Agriculture and Life Science, Chungnam National University) ;
  • Cho, Kwanghyun (National Institute of Animal Science, RDA) ;
  • Choi, Yunho (National Institute of Animal Science, RDA) ;
  • Choi, Taejeong (National Institute of Animal Science, RDA) ;
  • Park, Byungho (National Institute of Animal Science, RDA) ;
  • Lee, Donghee (University of Seoul)
  • Received : 2013.02.18
  • Accepted : 2013.05.30
  • Published : 2013.11.01
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Abstract

This study was performed to estimate the effect of age at first calving and first two calving intervals on productive life and life time profit in Korean Holsteins. Reproduction data of Korean Holsteins born from 1998 to 2004 and lactation data from 276,573 cows with birth and last dry date that calved between 2000 and 2010 were used for the analysis. Lifetime profit increased with the days of life span. Regression of Life Span on Lifetime profit indicated that there was an increase of 3,800 Won (approximately $3.45) of lifetime profit per day increase in life span. This is evidence that care of each cow is necessary to improve net return and important for farms maintaining profitable cows. The estimates of heritability of age at first calving, first two calving intervals, days in milk for lifetime, lifespan, milk income and lifetime profit were 0.111, 0.088, 0.142, 0.140, 0.143, 0.123, and 0.102, respectively. The low heritabilities indicated that the productive life and economical traits include reproductive and productive characteristics. Age at first calving and interval between first and second calving had negative genetic correlation with lifetime profit (-0.080 and -0.265, respectively). Reducing age at first calving and first calving interval had a positive effect on lifetime profit. Lifetime profit increased to approximately 2,600,000 (2,363.6) from 800,000 Won ($727.3) when age at first calving decreased to (22.3 month) from (32.8 month). Results suggested that reproductive traits such as age at first calving and calving interval might affect various economical traits and consequently influenced productive life and profitability of cows. In conclusion, regard of the age at first calving must be taken with the optimum age at first calving for maximum lifetime profit being 22.5 to 23.5 months. Moreover, considering the negative genetic correlation of first calving interval with lifetime profit, it should be reduced against the present trend of increase.

Keywords

References

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